Capturing the Missing Baryons with X-ray and Sunyaev-Zel.dovich Data

Stacking of SZ signals (Y) by stellar mass produces a significant signal, whichhas been used to infer the halo gas mass of galaxies. Interpreting the stackedsignal assumes the Y distribution (at fixed M*) is narrow, symmetric, and for auniform sample of objects. These conditions are violated when stacking instellar mass bins, so one must understand the distribution of Y as a function ofgalaxy environment (M*, gal/M*,tot). This cannot be obtained from the weakindividual SZ signals, but can be inferred from Xray observations. We proposeto complete our Xray studies of 15 nearby galaxies that were previously used ina stack of SZ signals. We will measure the distribution of Y _X (Xray analogof SZ) to quantify the dependence of halo gas mass on galaxy environment. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]